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No description available.

Measurements of the Ƭ lepton polarization and forward-backward polarization asymmetry near the Z° resonance using the OPAL detector are described. The measurements are based on analyses of [special characters omitted] decays from a sample of 144, 810 [special characters omitted] candidates corresponding to an integrated luminosity of 151 pb-1. Assuming that the Ƭ lepton decays according to V-A theory, the average Ƭ polarization near [special characters omitted] is measured to be [special characters omitted] = (-14.10 ± 0.73 ± 0.55)% and the Ƭ polarization forward-backward asymmetry to be [special characters omitted] = (-10.55 ± 0.76 ± 0.25)%, where the first error is statistical and the second systematic. Taking into account the small effects of the photon propagator, photon-Z° interference and photonic radiative corrections, these results can be expressed in terms of the lepton neutral current asymmetry parameters: AƬ = 0.1466 ± 0.0076 ± 0.0057, Ae = 0.1464 ± 0.0108 ± 0.0036. These measurements are consistent with the hypothesis of lepton universality and combine to give [special characters omitted] = 0.1455 ± 0.0073. Within the context of the standard model this combined result corresponds to sin [special characters omitted] = 0.23172 ± 0.00092. Combining these results with those from the other OPAL neutral current measurements yields a value of sin [special characters omitted] = 0.23211 ± 0.00068. / Graduate

Thesis--University of California, Berkeley, 1960. / "Chemistry General" -t.p. Includes bibliographical references (p. 70-73).

<p> A variety of experiments has been performed in order to establish and identify the states in 191Ir and 193Ir. From radioactive decay, the energies and intensities of the gamma rays and internal conversion electrons have been measured with high precision using Ge(Li) detectors and the Chalk River π√2 spectrometer. A series of gamma-gamma coincidence experiments were performed using Ge(Li) detectors. The gamma rays following Coulomb excitation of 191Ir and 193Ir were also measured with Ge(Li) detectors. In addition, (3He,d) and (α,t) transfer reactions were performed and the reaction products analyzed by means of an Enge split-pole spectrograph. From these data, the energies, spins, parities and spectroscopic factors for the states in 191Ir and 193Ir have been established and interpreted in terms of the Nilsson model with band mixing.</p> / Thesis / Doctor of Philosophy (PhD)

Master of Science / Department of Geology / Sambhudas Chaudhuri and Matthew Totten / The current model of hydrocarbon generation involves the thermogenic maturation of organic material as a consequence of burial. This process only considers energy generated from temperature increase due to burial. The majority of organic rich source beds contain high concentrations of radioactive elements, hence the energy produced from radioactive decay of these elements should be evaluated as well. Previous experiments show that α-particle bombardment can result in the generation of hydrocarbons from oleic acid. This study investigates the effects of γ-rays in a natural petroleum generating system. In order to determine the effects of γ-rays, experiments were conducted using cesium-137 as the γ-ray source at the KSU nuclear facilities to irradiate crude oil and organic material commonly found in petroleum systems. The samples were then analyzed using Fourier Transform Infrared Spectroscopy (FTIR) and Rock-Eval pyrolysis to determine changes in the samples. The FTIR results demonstrated that γ-radiation can cause the lengthening and/or shortening of hydrocarbon chains in crude oils, the dissociation of brine (H2O (aq)), the production of free radicals, and the production of various gases. These changes that come from γ-radiation hold the possibilities to distort the configuration of organic molecules, dissociate molecular bonds, and trigger oxidation-reduction reactions, all of which could provide an important step to the onset of dissociation necessary to create hydrocarbons in petroleum systems. Further understanding the effects of γ-radiation in hydrocarbons systems could lead to more information about the radiolytic processes that take place. This could eventually lead to further understanding of oil generation in organic-rich source beds.

Thesis (M. S.)--Mechanical Engineering, Georgia Institute of Technology, 2009. / Committee Chair: van Rooijen, Wilfred; Committee Member: Hertel, Nolan; Committee Member: Stacey, Weston

Thesis (M.S. in Physics)--Naval Postgraduate School, March 2010. / Thesis Advisor(s): Rodeback, G. W. "January 1962." Description based on title screen as viewed on June 2, 2010. DTIC Descriptor(s): Research Reactors, Hafnium, Half Life, Pneumatic Equipment, Measuring Instruments, Reactor Cores, Shielding, Detection, Gamma Emission, Computer Programming, Radioactive Isotopes, Radioactive Decay, Mixtures, Scintillation Counters, Isotopes, Least Squares Method. DTIC Identifier(s): AGN-201 Reactors, Fortran. Includes bibliographical references (p. 25). Also available in print.

Thesis (Master's)--University of California, Berkeley, 1959. / "Chemistry General" -t.p. "TID-4500 (15th Ed.)" -t.p. Errata sheet at end. Includes bibliographical references (p. 41-43).

The MicroBooNE experiment is a liquid argon time projection chamber with 85-ton active volume at Fermilab, operated from 2015 to 2020 to collect neutrino data from Fermilab’s Booster Neutrino Beam. One of MicroBooNE’s physics goals is to investigate possible explanations of the low-energy excess observed by the MiniBooNE experiment in 𝜈_𝜇 → 𝜈_𝘦 neutrino oscillation measurements. MicroBooNE has performed searches to test hypothetical interpretations of the MiniBooNE low-energy excess, including the underestimation of the photon background or instrinic 𝜈_𝘦 background. This thesis presents MicroBooNE’s searches for two neutral current (NC) single-photon production processes that contribute to the photon background of the MiniBooNE measurement: NC Δ resonance production followed by Δ radiative decay: Δ → 𝛮_𝛾, and NC coherent single-photon production. Both searches take advantage of boosted decision trees to yield efficient background rejection, and a high-statistic NC ?0 measurement to constrain dominant background, and make use of MicroBooNE’s first three years of data. The NC Δ → 𝛮_𝛾 measurement yielded a bound on the Δ radiative decay process at 2.3 times the predicted nominal rate at 90% confidence level (C.L.), disfavoring a candidate photon interpretation of the MiniBooNE low-energy excess as a factor of 3.18 times the nominal NC radiative decay rate at the 94.8% C.L. The NC coherent single-photon measurement leads to the world’s first experimental limit on the cross-section of this process below 1 GeV, of 1.49 × 10−41cm² at 90% C.L., corresponding to 24.0 times the nominal prediction.